Dell Precision 3430 Small Form Factor Service Manual

Installing the system board

Hold the system board by its edges, and align it towards the back of the system.
Lower the system board into the system chassis until the connectors at the back of the system board align with the slots on the chassis, and the screw holes on the system board align with the standoffs on the system chassis [1,2].
Replace the 5 screws that secure the system board to the system [1], the single (M3x5) screw [2], and the single (#6-32) screw [3].
Align the cables with the pins on connectors on the system board and connect intrusion switch cable [1], PSU power cable [2], data cable [3], system fan cable [4], SATA cable [5], SATA power cable [6] to the system board:
Insert the hook on the I/O panel into the slot on the chassis and rotate to close the I/O panel [1].
Replace the screw to secure the I/O panel to the chassis [2].
Connect the power switch cable [3], route the power cable through the retention clips on the chassis [4], psu cable [5] and, intrusion switch cable [6] from the connectors on the system board.
Install the:
Follow the procedure in After working inside your computer.